Submission #218105

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
218105	2020-04-01 08:31:25	quocnguyen1012	Safety (NOI18_safety)	C++14	100 / 100	157 ms	7208 KiB

safety

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#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;
 
ll a[200001];
priority_queue<ll> L, R;
 
int main() {
  int n;
  ll h;
  cin >> n >> h;
  FOR(i, 0, n) cin >> a[i];
 
  ll ans = 0;
  L.push(a[0]); R.push(-a[0]);
  FOR(i, 1, n) {
    ll X = L.top() - h * i, Y = -R.top() + h * i;
    if (X > a[i]) {
      ans += X - a[i];
      L.push(a[i] + h * i);
      L.push(a[i] + h * i);
      R.push(-X + h * i);
      L.pop();
    } else if (Y < a[i]) {
      ans += a[i] - Y;
      R.push(-a[i] + h * i);
      R.push(-a[i] + h * i);
      L.push(Y + h * i);
      R.pop();
 
 
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